Tungsten

Tungsten
An Internet Hotlist on Tungsten

created by ThomasLara09

Introduction | Element info | Toxicity info | Atomic measurements

Introduction

Tungsten Filament from http://www.daviddarling.info/encyclopedia/T/tungsten.html

Rating System

One Hammer: Poor, is of little or no help to reader

Two Hammers: Basic information, not very helpful

Three Hammers: Contains some good information

Four Hammers: Contains good informaion, helpful

Five Hammers: Contains good infomation, organized, very helpful. A good resource.

Atomic Number: 74

Atomic Mass: 183.84

Physical characteristics: Hard, grey to white color, Melting point is 3410.0 ° C, lustrous, heavy

Chemical properties: Tungsten reacts with fluorine (F2) at room temperature and forms tungsten fluoride (WF6).

Toxicity: Tungsten will irritate the eyes (making them water) and skin (rash) if they contact. Tungsten irritates the respiratory system. Tungsten is not believed to be a hazard to the environment. Tungsten compounds are highly toxic.

Uses: Usually alloyed with other metals to make them stronger. Used to make spacecraft equipment, drill bits, military armor and cutting tools, furnaces and filaments of light bulbs.

Manufacturing and or production: China controls about 75% of the world's tungsten resources. Tungsten is also found in California, South Korea, Colorado, Russia, Bolivia, and Portugal. Tungsten is very important to the petroleum and mining industries. Tungsten is also very useful for metalworking.

History/discovery: Tungsten was discovered in Vergara Spain in 1779

Interesting aspects of the element: It has the highest melting point and lowest vapor pressure of all non-alloyed metals.

The Internet Resources

Element info

International Tungsten Industry Association - This site was professional. You had to follow links in order to find information, but other than that it was well organized. This site earns 4 hammers. Tungsten is very important in the electrical industry because it is so durable. Tungsten is used in computers, x-rays, microwaves, wires, cooling units, conductors and more. Compounds of tungsten are found in paints, pigments, and catalysts. Incorporating tungsten into steels makes the metal more resistant and much tougher.
It’s Elemental – Tungsten - This was a great site because it was well organized. The site was easy to read, and did not contain excessive information. The site earns 4 hammers. Tungsten is a metal. Tungsten is a solid at room temperature. Tungsten’s melting point is 3695 K. Tungsten’s boiling point is 5828 K. Tungsten can be alloyed with other metals, especially steel, to make strong tools.
The Element Tungsten - This site was well organized and contained basic information. There were ads, but that was the only problem. This site earns 3 hammers. Tungsten can conduct electricity and heat. Tungsten Carbide is used to make jewerly. Tungsten has a cubic crystal structure. Tungsten is used in armaments. Tungsten is brittle
Tungsten - This site was very unorganized and was even unfinished. Ads littered the edges and the format was messy. The information that was included was not very useful. This site earns one hammer. The atomic weight of tungsten is 183.84. Tungsten can be described as “metallic” and “lustrous”. Tungsten has the “lowest vapor pressure of all metals.” Tungsten can be found in many forms.
Tungsten PT - This site was well organized and easy to read. It contained basic information. The site earns 3 hammers. Tungsten’s atomic radius is 137.0 pm. China controls about 75% of the world's tungsten resources. Tungsten is also found in California, South Korea, Colorado, Russia, Bolivia, and Portugal. Tungsten is very important to the petroleum and mining industries. Tungsten is also very useful for metalworking.
Tungsten from Wikipedia - This site was very thorough, and contained great information. The site earns 4 hammers. Tungsten is also known as wolfram. Tungsten’s atomic element is 74. The element tungsten is very hard. Tungsten is known for having the “highest melting point of all the non-alloyed metals.” Tungsten is also heavy. Its color varies from steel colored to white.
Tungsten or Wolfram - This site was littered with ads. Nevertheless, the site was organized well, contained useful information and no excessive information. This site earns 3 hammers. Production of tungsten for commercial use occurs “by reducing tungsten oxide with carbon or hydrogen”. Tungsten’s electron configuration is [Xe]6s24f145d4. Tungsten is very resistant to corrosion. It is also resistant to most acids. Hastelloy and Stellite both contain tungsten.
Visual Elements: Tungsten - This site was incredibly brief. I did not find any new information on it. This site is best for people who just want the very basic information on tungsten. The site earns 1 hammer. Tungsten is used in the filaments of light bulbs. Alloying any metal with tungsten makes it stronger. Tungsten is used in military armor and cutting tools. Tungsten is also known as wolfram.

Toxicity info

ToxFAQs™ for Tungsten - This site is specifically for the toxicity information of Tungsten. The site was well organized and easy to read. The site earns 3 stars. In humans, there are no specific health problems associated with tungsten. Tungsten never occurs as a pure metal. Low level exposure to tungsten can occur when drinking water, breathing air, or eating food containing Tungsten. It is unlikely that one would be exposed to large amounts of Tungsten. The element is considered non-toxic.
Tungsten – W - This site was well organized. The site contained good information and was easy to read. The site earns three hammers. Tungsten is used in microchip technology. Tungsten will irritate the eyes (making them water) and skin (rash) if they contact. Tungsten irritates the respiratory system. Tungsten is not believed to be a hazard to the environment. Tungsten compounds are highly toxic.

Atomic measurements

Element Tungsten- W - This site contained many measurements of Tungsten that were not available on other sites. This site is good for people searching for the properties and potential of tungsten. Unfortunately, the site was littered with links and ads. The site earns 3 hammers. The density of Tungsten is 19.35g/cc. Tungsten is combustible. Tungsten was discovered in Vergara Spain. The word tungsten means “heavy stone.”
Introduction to Tungsten - This site contained a lot of information, but it was not useful for this project. The site could have been better organized as well. This site earns three hammers. Tungsten is found in wolframite, scheelite, huebnertie, and ferberite. Tungsten has 20 unstable isotopes. Tungsten is used in making furnaces and spacecraft equipment. Tungsten, in its impure form, is brittle and fragile. Chemical and tanning industries use tungsten salts.
Periodic Table: Tungsten - This site was an average site, and earns 2 hammers. The site mainly consisted of scientific measurements. Tungsten was discovered in 1783. This element was discovered by Fausto and Juan Jose de Elhuyar. The atomic symbol of tungsten is W. Tungsten is considered a transitional metal. Tungsten has 74 protons/electrons. It also has 110 neutrons.
Tungsten Metal - This site was composed of measurements of the element. It did not contain much information that was useful for my project. The site was well organized and easy to read. The site earns 2 hammers. The site contained a nice chart about tungsten’s isotopes. Tungsten’s thermal conductivity is 1.74 W/cmK. Tungsten’s heat of fusion is 35.40 kJ/mol. Tungsten’s heat of vaporization is 824.0 kJ/mol.
Tungsten element facts - This site only contained measurements of tungsten. The site also appeared incomplete because some information was left blank. The site earns two hammers. Tungsten is used in drill bits. The cost of tungsten is currently $11 per 100g. Tungsten has 5 isotopes. Tungsten’s heat of fusion is 35.40 kJ/mol. Tungsten’s specific heat is 0.13 J/gK.

Content by ThomasLara09
http://www.kn.att.com/wired/fil/pages/listtungstenth.html
Last revised Sat Jan 5 7:08:27 US/Pacific 2008